Drawing from economics, history, philosophy, biology, and much else besides, Avent shows that our capacity for belief is what connects us, guides our behavior moment by moment and year by year, and determines how well we cooperate in the production of social and economic complexity. Far from standing in opposition to science and reason, faith is central to the human endeavor. By understanding the nature of faith and how it forms the fabric of our society, we can better find ways to come together to tackle the global crises of rising authoritarianism and climate change that threaten us all, and find hope within one another.